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Assignorico GeaH-Sanbofn Self Clamping? Paper Cutter.

' DEG 141869 THE noRms PETERS ca, WASHINGTON, n. 154

' Z'o all whom it may concern.-

THOMAS o. ROBl'NSON, or merel MASSACHUSETTS, .ASSIGNO'R- T0 GEORGE H. SANBORN,

OF NEW YORK 'l'lY.

Letters Patmit No. 97,816, dated December 14, 1869) IMPROVEMENT IN PAPER-CUTTING MACHINES- The Schedule referred to in these Letters Patent and maklnz dark of the same.

' Be it known that I, Tnoams (l. Ronixsos, of Boston, in the county of Suffolk, and State of Massachusetts, have invent-ed a new and useful Selt fllamping Pa er-Outter; and 1 do hereby declare the following to e a full and correct description of thc'samc, reference be'ing had to the accompanying drawings, in which I I t Figure 1 is a front elevation ofthe ii'iachinc; Figure 4 is an. end View; Figure 6, a top view or plan; and Figures 2, 3, and 5, details. The same letter indicates the same part wherever it occurs.'

The nature of tho invent-ion consists in the operation of the knife by screws, which work it in both directions, their motion being automatically reversed, at, the end of the up and down stroke oi'tho knife, by

a clutch.

To enable others to make and use my improved cutting-machine, I will proceed to describe its construct-iou and operation.

A strong frame, A, of the character and form represented, supports the table T and the operative parts.

A winch, O, and disk-wheel, 1), indicate the point ,of application of the driving-power to the main shaft E, which extegnls across the machine, from side to side, as shown. e e

On this shaft are the loose gears'h and H, and the clutch G, which plays between them on a feather attached to the sl'iaft. 'By engagement with the clutch, either of the loose gears is fixed to the shaft, and made to turn with it. v

The gear H engages an intermediate gear I, hung to abraoket on the bottom of table T, which engages with gear .1, on shaft'L.

Gear F engages with gear M, on shaft L.

The gears J and M are both fixed to the shaft 11,

I and on the'ends of that shaft are the bevelled pinions lg lg, engaging, respectively, with the bevelled wheels These wheels are hung to' the sides of the frame in brackets 1).

Their naves are threaded, and receive the screws P P, which are driven up or down, as the wheels 0 0' rotate in one or the other direction.

To the upper ends of the screws P.- l" are attached the yokes Y, (see fig. 5,) carrying the rollers It at their upper extremities.

The yokes have a vertical-reciproeating movement in guides in the frame. They carry with them the knife-stock K, which hasa slit, a, in each end, to receirc the roller It, attached to the top ,of the yoke. This construction allows the yoke to'eommunicate an np-aud-down movement to the knife-stock, without interfering with its lateral movement.

,ment in slots-in the. main frame.

The knife-stock K has a*vertical-reciprocating move- To its lower edge is attached the knife-blade B, the edge of which is received in a groove in the table 'I.

The knife-stock has two inclined slots, S S, which receive two rollcrs r attaclurd to the clamp 0'. (See figs. l and.3.)

fThese rollers are confined to their axes by nuts 0 and screws 1).

The clamp C works vertically in ways in the frame, parallel to the slots in which the knife-stock moves. it results from this construction and connection of the knife-stock and clamp, thatas the knife-stock descends, it increases the pressure of theclamp upon the paper below it. force necessary to impartlateral movement to the knife, such lateral movement takesplace, and forms,

with the downward motion of the knife, the drawcut. Thus the maximum of pressure is applied to the mass of paper under operation at the moment when the draw-cutrenders it most necessarv to clamp the paper tightly.

The reversal of the direction of motion of the knifestock is effected by means of the clutch G and its shifting mechauism, which is clearly represented in to the impulses of the toe Q, which plays up and down 7 in the slot of slide U, and alternately comes into contact with the upper and lower sides of that slot.

To an arm, U, of the slide U, is pivoted the arm X, the opposite end of which is fixed to the bolt 1, so that the bolt cannot turn in the arm as this is moved.

The bolt 9 passes througha hole in the outer end of the bracketZ, and then receives the lower arm of yoke G, which is screwed into it. I

As the bolt g is turned in bracket Z by the movement of arm X, the yoke G is thrown to one side or the other, carrying with it the clutch G, which ongages either with gear I! or gear H, according to the direction in which the yoke G is thrown.

The armX receives its motion from the slide U, to the arm of which it is pivoted.

The operation is as follows:

Power being appliedto the main shaft, and'the clutch G thrown into gear with the wheel H, motion is imparted to shaft L, through gears Iand. J, and the wheels 0 O are set in motion by the piuions N'N'.

The motion of wheels 0 0' is communicated to the When this pressureonore than equals thescrews 1 l", wl ielulraw down the knife-stock K, and withit the clamp O The clamp holds the paper. being operated upon firmly on the table while it is being cut by the blade the toe Q comes into contact with the bottom of the" slot in slide U, and threes down arm X, which, by the help of the'weight it, throws the clutch G into ongagement with wheel l!, which, through gear M, re-

verses the motion of shaft L and screws]? 1", thus lifting the knife from the table preparatory to a repe- 4 tition of the operation.

\Vhen t-he knife-stock reaches its highest position,

' the toe Q comes into contact with the upper end of the slot in slide U, and raises the slide, again reversing'the position otthe clutch G, and giving a descending movement to the knife.

Having thus fully described my invention,

What .i' claim, and desire to secure by Letters Patent, is 1. The yokes Y, constructed as described, in combination with the'screws 1 1 and the knife-stock K, having the slits a a in its ends, as and for the purpose stated.

2. The automatic reversing-ineehanism for operat ing the clutch, the same consisting of the combination and arrangement of the toe Q, slide U, arm X, boltg, yoke G, and weight B, in the manner specified.

The above specification of my said invention signed 1nd witnessed at Washington, this 11th day of May,

'1. (J. ROBINSON. Witnesses A. C. BRADLEY, Orms. 1*. Smysnvm'. 

